Views: 89 Author: Site Editor Publish Time: 2025-12-11 Origin: Site
Technology Focus: Linear Relationship between the Stress and the Loading Displacement of Disc Spring at the Point of OM
In the mechanical performance analysis of disc springs, the stress state at the OM point (upper surface center layer point) serves as a key indicator for evaluating their strength and fatigue life. Leveraging its profound expertise in disc spring technology and practical analysis, Jiangsu Sunzo Spring provides a clear explanation of how this critical stress point evolves during loading: it exhibits a distinct linear growth characteristic.
OM point is located on the upper surface of the disc spring, which is an important position for monitoring stress in both theoretical calculation and practical application. Its stress value (σOM) is directly related to:
Safety Margin of Static Strength of Disc Spring
The Basis of Fatigue Life Prediction
Rationality Verification of Materials and Heat Treatment Process
In GB/T 1972 and related design specifications, the allowable stress of this point has a clear limit.
Theoretical derivation (e.g. AL formula) and finite element analysis can confirm that the stress (σOM) at point OM is linearly proportional to the loading displacement (f) in the elastic working range of the disc spring.
i.e. σOM ∝ f
It means that ：
With the compression of disc spring, the displacement f increases, and the stress value σOM increases linearly.
When the displacement reaches the maximum design value (e.g. 0.75h₀), the σOM stress also reaches its peak value under working conditions.
This linear relationship simplifies the stress prediction in the design process, and makes it possible to control the key stress level indirectly by controlling the working displacement.
Understanding this linear law is of great value to the design and safe application of disc spring.
1. Simplified design verification: The designer only needs to calculate the σOM stress at the maximum design displacement to determine whether it is within the allowable range, without calculating the entire loading path.
2. The process control is to control the free height (h₀) and the thickness of the product, so that the stress level of the product is consistent under the same compression, and the performance is consistent.
3. Failure analysis basis: If the disc spring fails early in use, the actual displacement or load can be back calculated whether it exceeds the limit by combining the linear relationship.
At Jiangsu Sunzo Springs, we maintain precise quantitative control over the internal stress conditions of disc springs.
In the design stage, we use the theoretical calculation and CAE simulation to predict the stress course of the OM point and other key points under different working conditions, so as to ensure the safety and rationality of the design.
Manufacturing stage: By precise control of key dimensions (h₀, t) and stable heat treatment process, the slope of the stress-displacement linear relationship (i.e. equivalent stiffness) is ensured to be stable, thus guaranteeing the reliability and predictability of product performance.
Service Support: We provide clients with stress point calculation and evaluation services to optimize application solutions and prevent overload risks.
We are committed to translating clear mechanical principles into stable and reliable product performance. Every disc spring bearing critical functions operates within fully predictable and controllable mechanical parameters, ensuring your equipment with reliable performance.
SUNZO has it’s own researching and development team and test center, has participate in rule-making of the latest national industry standards and the international ISO standards for disc springs.
English